Benefits of Midi to Wav

You can get a digitally exact recording that way - as it doesn't have to go through the soundcard first.

There is absolutely no noise

If the recording requires a lot of polyphony, no problem as the conversion just takes as long as it takes.

Works on Vista or Windows 7 even on computers that are unable to record to WAV at the same time as they play.

Alternative method - digitally exact recordings in Vista or Windows 7

Some software is able to record the digital data on its way to the soundcard in which case the resulting recording is digitally exact and clean just like a normal Midi to Wav conversion (so long as your computer is fast enough to play the music in real time).

This method works even if your computer is normally unable to record "What u hear" as it uses a different method to get the recording.

ITunes Method

Then in ITunes go to the Edit menu and click on "Preferences". Select the "General tab". Go down and click on "Import Settings". Then on "Import Using", choose "WAV Encoder". Then save your your settings by clicking "OK".

Now you need to show the midi files in ITunes. You can drag and drop them into iTunes - or an easier method if they are all in one folder is to go to File in iTunes and select Add Folder to Library. For individual files you can also use File | Add to Library.

Then again in iTunes, right click on the file you want to convert to WAV and select Create WAV version.

The WAV file is created using the instruments for the QuickTime midi engine which is reasonable quality.

You can find your output file if you scroll down to Recently Added in the Playlists list. You can then drag and drop to get it back to the same folder as the original .avi for the merge.

Free solution. Uses the Quicktime instruments, which are reasonable quality. But can't handle any other sound sets

Great solution for XP, as a quick way to make an audio clip from a midi file. I've often used it there. I'm not sure if it works with Vista / Windows 7 though.

Low cost, easy to use. Sounds are of reasonable quality. Also adds many extra instruments for your Instruments menu Don't know if it works for Vista or Windows 7

SynthFont

SynthFont - You can load any soundfont into the program and use it to convert the midi to wav.

Free Solution. Can use any soundfont, and also gig files so can be excellent quality

Export to audio from your DAW, Ableton, Sonar, Kontakt etc.=

Most DAWs and similar programs nowadas offer export of midi to wav.

However if you don't have the program, the cost may be higher than you expect, and there may be an initial learning curve. May not be the best method if you don't need a DAW (Digital Audio Work station) and just want to convert some midi files to .WAV.

NEED TO TEST THIS

If you have one of these programs already then this is a good solution

Export from the Garritan Personal Orchestra Aria Player

Great sound set. So should work well - especially if you want natural sounding instruments.